Journal
INTERNATIONAL JOURNAL OF CIRCUIT THEORY AND APPLICATIONS
Volume 44, Issue 5, Pages 1173-1185Publisher
WILEY
DOI: 10.1002/cta.2156
Keywords
acoustic sensor; delta-sigma analog-to-digital converter (ADC); low power; small size; weak inversion region
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Funding
- MSIP (Ministry of Science, ICT, and Future Planning), Korea, under ITRC (Information Technology Research Center) support program [IITP-2015-H8501-15-1002]
- Industrial Core Technology Development Program - Ministry of Trade, Industry, and Energy [10049095]
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This study presents an ultra-low-power, small-size, 1-bit, single-ended, and switched-capacitor (SC) delta-sigma analog-to-digital converter (ADC) for wireless acoustic sensor nodes. This wireless sensor node has a delta-sigma ADC that converts the sensed signal to a digital signal for convenient data processing and emphasizes the features of small size and low-power consumption. The chip area of the delta-sigma ADC is dominated by the capacitor; therefore, a novel common-mode (CM) controlling technique with only transistors is proposed. This ADC achieves an extremely small size of 0.08mm(2) in a 130-nm CMOS process. The conventional operational transconductance amplifiers (OTAs) are replaced by inverters in the weak inversion region to achieve high power efficiency. At 4-MHz sampling frequency and 0.7-V power supply voltage, the delta-sigma ADC achieves a 55.8-dB signal-to-noise-plus-distortion ratio (SNDR) and a 298-fJ/step figure-of-merit (FOM) in a signal bandwidth of 25kHz, while consuming only 7.5W of power. Copyright (c) 2015 John Wiley & Sons, Ltd.
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